again i tried to do the diag,. test as book stated noting come up. because it says put in the 12 clock position and run through each one , tried all cycles nothing , and changed the thermister and it is still not heating but when i took the drum out there was a lot of black powdered stuff back of dryer near thermastat.there is nothing in the book about the cide ad and what it means please someone help me fix this dryer